CCSS Analysis Concept Proposal:

Transcription

1 CCSS Analysis Concept Proposal:. Study Title: Infertility, assisted reproductive technology utilization and pregnancy outcomes in childhood cancer survivor population: A CCSS and SART CORS data linkage study 2. Working group and investigators: a. Working group: Chronic disease and Epidemiology/Biostatistics b. Investigators: i. Kimberly Keefe, MD: kwkeefe@bwh.harvard.edu ii. Elizabeth Ginsburg, MD: eginsburg@bwh.harvard.edu iii. Lisa Diller, MD: Lisa_Diller@dfci.harvard.edu iv. Sara Barton, MD: SBarton@ColoCRM.com v. Wendy Leisenring, ScD: wleisenr@fredhutch.org vi. Leslie Farland, ScD: lfarland@bwh.harvard.edu vii. Yutaka Yasui, PhD: Yutaka.Yasui@stjude.org viii. Daniel Green, MD: Daniel.Green@Stjude.org ix. Eric Chow, MD: Ericchow@u.washington.edu x. Kevin Oeffinger, MD: Kevin.Oeffinger@duke.edu xi. Gregory Armstrong, MD: greg.armstrong@stjude.org xii. 3. Background and rationale: Over 80% of childhood cancer patients survive long term; therefore, understanding the impact of cancer treatments on future fertility is a priority (Zebrack B 202, Phillips SM 205). Prior studies of female cancer survivors have shown that chemotherapy and/or radiation can lead to premature ovarian insufficiency or diminished ovarian reserve even when regular menses return post-treatment (Sklar CA 2006, Reh A 2008, Partridge AH 200). There appears to be a dose dependent relationship between chemotherapy and/or radiation and ovarian reserve (Gracia CR 202, Gao W 205). Additionally, spontaneous pregnancy rates for both female and partners of male childhood cancer survivors are affected by type and dose of chemotherapy administered or total dose of radiation exposure (Green DM 200, Chow EJ 206.) Limited data suggest that female cancer survivors have a higher risk of infertility and have poorer IVF outcomes if they seek infertility treatment (Ginsburg 200, Dolmans 2005, Barton SE 202, Barton SE 203). Though one study has touched on ART utilization in female childhood cancer survivors through self-reporting questionnaires (Barton 203), none has examined posttreatment ART outcomes of female childhood cancer survivors. Regardless of whether assisted reproductive technologies are used, both childhood and adult female cancer survivors are more likely to have preterm deliveries if pregnancies are achieved (Signello LB 2006, Mueller BA 2009, Lie Fong S 200, Madanat-Harjuoja L 200, Metallo 206). If female cancer survivors received pelvic radiation, their offspring are also at risk for low birth weight even after adjustment for preterm delivery (Green DM 2002, Reulen 2009). In male childhood cancer survivors and their partners, there was no significant increase in adverse outcomes in spontaneous pregnancies compared to controls (Green DM 2003, Reulen 2009).

2 study has examined pregnancy outcomes specifically in female childhood cancer survivors who have undergone ART. Barton SE et al (203) examined infertility, infertility treatment and pregnancy outcomes in the Childhood Cancer Survivor Study (CCSS) population. Based on self-reported survey data, 353 CCSS females were compared to 366 sibling female controls. Survivors had increased risk of clinical infertility at earlier reproductive ages when compared to controls. Smaller subgroups answered questions based on infertility treatment. Both survivors and controls were equally likely to seek infertility treatment (35/455, 69.2% vs. 00/37, 73.0%), but survivors were less likely to be prescribed infertility medication (87/208, 4.8% vs. 56/75, 74.7%), which suggests a lower utilization of ART. This study was limited by its utilization of self-reported data, it did not include IVF specific information, and it included only the original CCSS cohort of women diagnosed between 970 and 986. The first birth from IVF in the US was in 98 and thus, in the earlier reproductive years of the original CCSS cohort, ART was less widely available and less likely to be commonly utilized. Thus, ART utilization may be higher among the expanded CCSS cohort due to increased availability of the technology in the more recent era. The Society for Assisted Reproductive Technology Clinic Outcome Reporting System (SART CORS) database includes comprehensive data from more than 90% of all assisted reproductive technology (ART) clinics in the United States of America. Historically, data for IVF cycles were collected and verified by SART and then reported to the CDC in accordance with the Fertility Clinic Success Rate and Certification Act of 992 (Public Law ). In 2004 SART changed its contract with the CDC and gained access to the SART CORS data for research purposes. Thus, data starting in 2004 are available for research purposes to persons or entities who agree to comply with SART research guidelines. Patients undergoing ART at SARTassociated clinics sign consent forms that include permission to use their data for research. The data are submitted by individual clinics and vouched for by the director of each clinic. Approximately 0% of clinics are audited each year by the CDC and SART to validate the accuracy of the reported data. Accuracy is high. Prior studies have utilized Redshift Technologies to reliably link the SART CORS database to other databases. In Luke B et al (202), SART CORS was linked to birth registries to elucidate cumulative birth rates with ART. An algorithm that utilized a woman s date of birth, last name, first name and social security number were used to match repeat cycles within a single clinic and between clinics. In a second linkage study, Luke B et al (206) linked SART CORS with state cancer registries to determine ART usage in adult cancer populations. Women with their first ART treatment in , as identified in the SART database, were linked to state registries in NY, TX and IL. 44 women were diagnosed with cancer (breast, endocrine, melanoma, female genital) within 5 years before the first ART cycle start. Mean age at cancer diagnosis was 33.4 yr. Women who had cancer started ART at a younger age and were less likely to achieve a live birth with autologous oocytes. Live birth rates among women using donor oocytes did not significantly differ by cancer status. We will utilize a similar process to link the CCSS cohort to SART CORS. 2

3 Our aim is to determine the utilization and success of IVF, as well as pregnancy outcomes, in childhood cancer survivors. We will compare childhood cancer survivors who underwent IVF to childhood cancer survivor siblings, as well as general and specific IVF populations for IVF cycle characteristics, implantation rates, clinical pregnancy rates, live birth rates, and pregnancy outcomes. We will accomplish this by linking the Childhood Survivor Cancer Study data to the SART CORS database. It is important to note that we will not address the utilization of non-art infertility treatments, potentially comprising a large proportion of infertility treatments in the US, because we cannot quantify this usage with the databases available. 4. Specific aims/objectives/research hypotheses: a. Determine utilization rate of ART in childhood cancer survivors as defined by utilizing ART in a SART member clinic at least once in any given year. i. Hypothesis : The ART utilization rate in childhood cancer survivors overall is higher than CCSS sibling controls and as compared to the general population in the US as reported by the CDC in the 207 MMWR Surveillance Summary, Assisted Reproductive Technology Surveillance-United States, 204. ii. Hypothesis 2: The ART utilization rate will be lower in childhood cancer survivors who have diagnoses and treatment that affect the brain or pelvic organ radiation as compared to other lower risk diagnoses in childhood cancer survivors and as compared to sibling controls. b. Compare cumulative and cycle-specific implantation, clinical pregnancy, and live birth rates in childhood cancer survivors who pursue ART to general and specific (male factor infertility) IVF populations. Hypothesis: Implantation, clinical pregnancy and live birth rates per stimulation, per embryo transfer, and therefore cumulatively, are lower in cancer survivors as compared to general and specific IVF populations. c. Compare pregnancy outcomes for childhood cancer survivors pursuing ART (gestational age at delivery, birth weight, route of delivery, and multiple gestation) to outcomes in siblings and general and specific (male factor infertility) IVF populations. i. Hypothesis: Childhood cancer survivors have more premature deliveries, lower birth weights, and lower risk of multiple gestations as compared to siblings, general and specific IVF controls. d. Determine donor gamete utilization and pregnancy outcomes in childhood cancer survivors as compared to siblings and general IVF population. i. Hypothesis: Childhood cancer survivors who undergo pelvic radiation or gonadotoxic chemotherapies are more likely to use donor gametes and have increased risk of premature delivery and lower birth weights than their siblings or as compared to a general IVF infertile cohort. 5. Subject population + Eligibility criteria: i. CCSS Survivor and Sibling (Control) Eligibility Criteria: a. Female Survivors and siblings enrolled in CCSS database and could potentially be found in SART CORS database 3

4 b. Between the years of , must have at least one year in which they were aged 8-55 ii. Available Survivor population: Tables and 2 below summarize the number of CCSS participants who have years of reproductive adult age that fall within the study time frame: Table : Number of females who were ages after CCSS cohort entry and prior to last follow-up in calendar years age Total in Each Age Group

5 tes: Each woman only appears once in each row, but may appear in multiple rows. For example, there are a total of 2392 women who were age 20 sometime between As a woman ages, she shifts diagonally down the table (e.g. she's 20 in 205, 2 in 206, etc). Follow-up is considered available from 5 years post cancer diagnosis to death (regardless of last date of CCSS survey) Tota Year Table 2: Number of females in the CCSS cohort (ages 20-55, years ) Years in Cohort ( ) N >= 009 >= >= >= >= >= >= >= >= >= >= 70 iii. Additional comparison populations for Aims b-d: 2. Women with only Male factor diagnosis: Women whose diagnosis of infertility is based solely on the infertility of her male partner (severe oligospermia, azoospermia, etc). These women are presumed to be 5

6 otherwise fertile, and do not have decreased ovarian reserve or uterine factor infertility which negatively impact IVF pregnancy rates. 3. General IVF Population (All IVF diagnoses): All women who undergo IVF with the full range of infertility diagnoses as defined by SART (male factor, endometriosis, ovulation disorders, diminished ovarian reserve, tubal factors, uterine factors, other factors, unexplained, multiple diagnoses) 6. Analysis framework: a. Outcome(s) of interest: i. ART utilization: dichotomous variable per person-year ii. Implantation rate: dichotomous variable per person per embryo transfer. Defined as number of gestational sacs/number of embryos transferred. iii. Clinical pregnancy: dichotomous variable per person. Defined presence of fetal heart rate. iv. Live Birth: dichotomous variable per person. Defined as infant born alive after 22 weeks gestation. v. Pregnancy outcomes:. Multiple pregnancy: dichotomous variable 2. Gestational age at birth: continuous variable by number of weeks 3. Birth weight: categorical variable b. Exploratory variables: (confounders and effect modifiers) i. Cancer specific:. Primary cancer diagnosis: categorical variable 2. Age at diagnosis: continuous variable 3. Treatment exposure a. Chemotherapy i. Cyclophosphamide exposure (dichotomous) + Age at exposure (continuous) ii. Procarbazine exposure (dichotomous) + Age at exposure (continuous) iii. Number of alkylating agents in total (categorical) iv. Dosage of each alkylating agent administered (if available, total dosage and dosage normalized to standard body surface area) v. Cyclophosphamide Equivalent Dose (CED) b. Radiation i. Maximum prescribed tumor dose to the abdomen body region (continuous) + Age at exposure (continuous) 6

7 ii. Average dose to right and left ovaries (continuous) + age at exposure (continuous) iii. Maximum prescribed tumor dose to the pelvic body region (continuous) + age at exposure (continuous) iv. Average dose to pituitary gland (continuous) + age at exposure (continuous) v. Maximum prescribed total body irradiation dose (continuous) + age at exposure (continuous) c. Stem Cell Transplantation (dichotomous) 4. Surgery: dichotomous variable a. Type of surgery: categorical variable by body part affected ii. ART specific:. Oocyte age: continuous variable Recipient age: continuous variable Parity: categorical variable 2. BMI: continuous variable 3. Smoking: dichotomous variable 4. Infertility diagnoses: categorical variable 5. Number of fertility diagnoses: continuous variable 6. AMH: continuous variable 7. Day 3 FSH: continuous variable 8. Number of fresh ART cycles: continuous variable 9. Number of frozen ART cycles: continuous variable 0. Number of cancelled ART cycles: continuous variable. Year of ART treatment: continuous variable 2. Cumulative FSH dosage: continuous variable 3. Cumulative HMG dosage: continuous variable 4. Trigger injection type: categorical variable 5. Number of oocytes: continuous variable 6. Number of mature oocytes: continuous variable 7. ICSI used: dichotomous variable 8. Assisted hatching used: dichotomous variable 9. Number of 2pn: continuous variable 20. Cleavage stage embryo transferred: dichotomous variable 2. Cleavage stage embryo quality: categorical variable 22. Blastocyst transferred: dichotomous variable 23. Blastocyst embryo quality: categorical variable 24. Number of embryos transferred: continuous variable 25. Donor sperm used: dichotomous variable 26. Donor egg cycle: dichotomous variable 27. Gestational carrier cycle: dichotomous variable 28. Insurance coverage state of residence: categorical variable (no coverage, Insurance coverage suggestion, Insurance coverage mandate) 7

8 c. Statistical Methods: i. For Aim a, all subjects who were eligible to contribute at least one personyear of data to SART (as defined above) will be included in the analysis. We will treat ART as a dichotomous variable (yes/no) evaluated for each person-year of inclusion in the eligible time frame and determine a rate of usage per 00 person-years using a Poisson regression framework. Since each subject may have different potential years of age and calendar year available for contribution to the analysis, we will examine these rates stratified by age and/or prior pregnancies (determined by CCSS surveys) to try to identify and understand potential survivor bias wherein subjects who did not enter the SART database time frame until later reproductive ages may have had ART prior to entry. ART utilization rates for survivors will be compared to those of CCSS siblings using Poisson regression models adjusted for current age. Descriptively, rates will be compared with general population reported by CDC (Sunderam S et al, 207). Among survivors, we will compare those who have diagnoses and treatment that affect the brain or pelvic organs as compared to other lower risk diagnoses in childhood cancer survivors. To evaluate socioeconomic influence on ART utilization, will examine ART utilization by state with the assumption that in an insurance-mandated state, socioeconomic status will play a lesser role in ART utilization. Ideally, we will be able to categorize states by insurance mandated status by year and utilize survivors most recent residence to classify and evaluate rates by type of state ( coverage, Insurance coverage suggestion, Insurance coverage mandated). ii. For Aims b, c, and d we will limit analyses to those survivors, siblings and other controls that utilized ART and will examine their reproductive outcomes. ART cycle characteristics of the subjects and comparison groups (in the Explanatory variable list above) will be compared. Outcomes described in section 6a will be examined using several methodologies. For binary outcomes, such as clinical pregnancies, live birth and multiple pregnancy, we will examine the proportion of women who attempted ART and achieved the outcome of interest and will examine the impact of covariates and comparisons between groups using logistic regression models. For multiple pregnancies, whether or not multiple embryos were transferred will be examined as a covariate or stratification factor. For all of the above analyses, comparisons will be made between survivors and siblings and male factor infertility patients utilizing comparison groups in models adjusted will be made for age at ART. Among survivors, we will examine the impact of diagnosis and cancer treatments on IVF outcomes. d. Tables/figures: 8

9 Table a: Patient demographics for Childhood Cancer Survivors and Siblings Factor Categories CCSS Population Woman s age (mean Age (at cancer diagnosis) years, SD) Parity n (%) 0 >2 Race/ethnicity n (%) -White -Asian or Pacific Islander -Black or African American - American Indian or Alaskan Native -Hispanic or Latino -t Asked -Refused -Unknown BMI n (%) < >40 Cancer type n (%) -Acute lymphoblastic leukemia -Acute myeloid leukemia -Other leukemia -Hodgkin Lymphoma -n-hodgkin lymphoma - Astrocytoma -Medulloblastoma, PNET -Other CNS tumors -Ewing sarcoma -Osteosarcoma -Kidney tumor -Soft-tissue sarcoma -Neuroblastoma - Other neoplasm Any chemotherapy Unsure Age at Exposure < Cyclophophamide Exposure Unknown CCSS Siblings 9

10 Procarbazine Exposure Unsure Unsure CED (mg/m 2 ) Any radiation Pelvis RT Dose Abdomen RT Dose RT to HPO Axis Dose Spinal RT Dose Total Body Irradiation Dose Stem Cell Transplant Removal of one ovary Unsure <5 Gy 5-0 Gy -20 Gy >20 Gy <5 Gy 5-0 Gy -20 Gy >20 Gy <5 Gy 5-0 Gy -20 Gy >20 Gy <2 Gy 2 Gy >2 Gy Unsure Unsure Removal of both ovaries Removal of uterus Other pelvic organ surgery Unsure Unsure Unsure Table b: Patient demographics for those pursuing fertility treatment 0

11 Factor Categories CCSS Population Woman s Age Age (at start of (mean years, SD) IVF) Parity n (%) 0 >2 Race/ethnicity n (%) -White -Asian or Pacific Islander -Black or African American - American Indian or Alaskan Native -Hispanic or Latino -t Asked -Refused -Unknown BMI n (%) < >40 Infertility diagnosis Number of infertility diagnoses -Male factor -Endometriosis -Ovulation disorders -Diminished ovarian reserve -Tubal factors -Uterine factors -Other factors -Unexplained >5 CCSS Siblings Male Factor Infertility General SART IVF Population Table 2: Patient cycle characteristics

12 Characteristics Oocyte age (years) Recipient age (years) Day 3 FSH (mean, SD) AMH (mean, SD) Number of fresh autologous oocyte IVF Cycles n (%) Number of frozen autologous oocyte IVF cycles n (%) > >5 Childhood cancer survivors CCSS Siblings SART IVF population Male factor IVF population Number of fresh donor oocyte IVF cycles n (%) Number of frozen donor oocyte IVF cycles n (%) Number of cancelled cycles n(%) Donor sperm used n (%) Stimulation protocol > >5 -GnRH agonist flare -GnRH agonist suppression -GnRH antagonist suppression -Clomiphene - Letrozole -Unstimulated 2

13 Cumulative FSH Dosage Cumulative HMG Dosage Trigger type Number of mature oocytes retrieved Mean (SD) ICSI n (%) Assisted hatching used n (%). 2 pn Mean (SD) Cleavage-stage embryo transfer n (%) Blastocyst transfer n (%) ne <2000IU IU IU >7000IU HCG Lupron Combination -Total transfers -. embryos transferred 2 3 >4 - Mean cell number of cohort -Total transfers -. embryos transferred 2 >2 Table 3. ART utilization in person-years by presence of state insurance mandate as compared to sibling controls Diagnosis Insurance mandated states Insurance suggested states N (personyears) All CCSS CCSS Siblings US Population 3

14 States with no insurance coverage Table 4: Probability of Conception and Live Birth Rate for women after ART by Oocyte Source and Gestational Carrier Status All cancers Siblings Male factor infertility SART IVF population Autologous oocytes (n, %) Donor oocytes (n, %) Autologous oocytes in gestational carrier (n, %) Donor oocytes in gestational carrier (n, %) Implantation rate Clinical pregnancy rate Live birth rate Implantation rate Clinical pregnancy rate Live birth rate Implantation rate Clinical pregnancy rate Live birth rate Implantation rate Clinical pregnancy rate Live birth rate Table 5: Probability of Other IVF Cycle Outcomes for Women after ART by Oocyte Source and Gestational Carrier Status 4

15 All cancers Siblings Male factor infertility SART IVF population Autologous oocytes (n, %) Donor oocytes (n, %) Autologous oocytes in gestational carrier (n, %) Donor oocytes in gestational carrier (n, %) Chemical Ectopic Spontaneous abortion Stillbirth Chemical Ectopic Spontaneous abortion Stillbirth Chemical Ectopic Spontaneous abortion Stillbirth Chemical Ectopic Spontaneous abortion Stillbirth Table 6: Likelihood of conception and live birth for women after ART by cancer diagnosis, limited to women who only used autologous oocytes Treatment N, women Implantation rate ne (Siblings) ne (SART IVF) ne (Male Factor) Hodgkin s lymphoma n-hodgkin lymphoma Leukemia CNS tumor Kidney tumor Neuroblastoma Soft-tissue sarcoma 5 Clinical pregnancy rate Live Birth rate

16 Bone tumor Table 7: Pregnancy outcomes in the live-born children of childhood cancer survivor population undergoing ART and controls from both male factor and general ART population Outcome Survivors Survivor Siblings Duration of gestation Gestation Birth weight, g Low Birth Weight (<2.5kg) n-lbw (2.5kg or higher) Small for gestational age Preterm Full term Unknown Singleton Twins Triplets or more < >4000 Unknown Unknown Male factor Infertility patients SART IVF population OR (95% CI) 7. Special considerations: a. Additional calculations include: cumulative live birth rate, live birth rate per embryo transferred, live birth rate per cycle start, live birth rate per egg retrieval, cancellation rate(including reason for cancellation) References: Agarwal A Semen Banking in Patients with Cancer: 20-Year Experience. International Journal of Andrology 23 Suppl 2:

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